Exchange email gateway advice...

I currently have 3 exchange 2003 servers on my internal network. I also have 1 exchange 2003 server on my dmz that servers as a OWA front-end for the internal servers. I also have a barracuda spam firewall on the dmz.

I currently have several external users connecting to my internal servers via pop3. The email for our domain flows through the barracuda to a server on my internal network.

I'd like to make the Exchange 2003 server on my dmz the only mail entry point. To be clear:

1.) I'd like the external mail to go to my barracuda, then to my dmz exchange server, then to my internal servers.

2.) I'd like external users to connect to the dmz server via pop3 to get their mail.

3.) I'd like to start using rpc over http for external users to get their mail. I want them to connect to the dmz server.

4.) I'd like for the dmz server to continue as my OWA front-end.

Is this possible or am I asking too much? Can anyone point me in the direction of some documentation to get me started?

1. You need to add a rule to your barracuda to forward all prot 25 traffic inbound to your OWA server, you need to enable SMTP service, System attendent, Information store service (with only the mailbox store mounted, not the public folder store. Its acctualy safe to delete the PF store on a frontend server).

2. If external users need to connect to exchange frontend server via pop to download emails you need to enable the msexchange pop service and start the default pop3 virtual server in the frontend and backend servers. You also need to open port 110 for pop connectivity to download messages.

3. You need to install a certificate and publish a public URL to direct all inbound port 80 traffic via firewall to frontend that will send the request to the respective backend server. You also need to install the RPC PROXY service for the RPC over HTTP to function.

4. If the frontend is acting as OWA now, i will remain so with no issues.

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